package com.jeeplus.modules.sys.utils;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;

import sun.misc.BASE64Decoder;
/**
*
* @author azj
* @create 2021-01-23 上午11:00
**/
public class EncryptUtils {
	/**
     * 密钥
     */
    private static final String KEY = "5ERTRPRFEwTWcAAA";// AES加密要求key必须要128个比特位（这里需要长度为16，否则会报错）

    /**
     * 算法
     */
    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";

    /**
     * main方法测试
     */
    public static void main(String[] args) throws Exception {
        String content = "{\"matterName\":\"cs\",\"matterStatus\":\"login2\",\"ids\":\"18108242682\",\"startTime\":\"2022-04-24 12:15:55\",\"gxUserId\":\"0004ac40a45844dead9e95f0a2e71cc7\",\"updateTime\":\"2022-04-25 12:15:55\"}";
        String encrypt = aesEncrypt(content, KEY);
        System.out.println("加密后：" + encrypt);
        String decrypt = aesDecrypt("PJg2RWDeFUGGASj/yW20i+5RDBQ51oDyL6FLZfuw80yhCoIYblOQ+2rwtuL7doh5ijhv/rwcrzSTJySb/UD9XqqgFxjPWEc5C98jD5c6dlnEX2tODPOp9T/OTuLM+SuhSP+ivLgpvOR8gJEjL7xPscVZuuLEZdv013r82VBFMaWpyzGwWeZ5d6+TFJeOTXNVWvIwFKKIWbrpA8+LMCb0se7OptZzHon+OHd91GOeyoB1N3pTgz+RsQrIS9vhhNOe", KEY);
        System.out.println("解密后："+decrypt);
    }


    /**
     * 公钥加密
     *
     * @param publicKeyText
     * @param text
     * @return
     */
    public static String encryptByPublicKey(String publicKeyText, String text) throws Exception {
        X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }



    /**
     * base 64 encode
     * @param bytes 待编码的byte[]
     * @return 编码后的base 64 code
     */
    public static String base64Encode(byte[] bytes){
        return Base64.encodeBase64String(bytes);
    }

    /**
     * base 64 decode
     * @param base64Code 待解码的base 64 code
     * @return 解码后的byte[]
     * @throws Exception 抛出异常
     */
      public static byte[] base64Decode(String base64Code) throws Exception{
        return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
    }


    /**
     * AES加密
     * @param content 待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的byte[]
     */
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));
        return cipher.doFinal(content.getBytes("utf-8"));
    }


    /**
     * AES加密为base 64 code
     *
     * @param content 待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的base 64 code
     */
    public static String aesEncrypt(String content, String encryptKey) throws Exception {
    	return base64Encode(aesEncryptToBytes(content, encryptKey));
    }

    /**
     * AES解密
     *
     * @param encryptBytes 待解密的byte[]
     * @param decryptKey 解密密钥
     * @return 解密后的String
     */
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);

        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
        byte[] decryptBytes = cipher.doFinal(encryptBytes);
        return new String(decryptBytes,"utf-8");
    }


    /**
     * 将base 64 code AES解密
     *
     * @param encryptStr 待解密的base 64 code
     * @param decryptKey 解密密钥
     * @return 解密后的string
     */
    public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
    	return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
    }
}
